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Presentation by Pal Dahlberg on Seminar Design of Fixed Structures with DNV Software (April 2012)
Citation preview
Pål Dahlberg, Principal Sales Executive, Sesam
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17. April 2012
SesamTM 40 years of success
Sesam Capabilities for Transportation & Installation Analysis
© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
Our tools – your solutions – your decisions
2
Linear analysis (wave, pile/soil)
Deflections, Stresses,
Code-check, Fatigue, Earthquake
Transportation, lifting
Deflections, Stresses,
Code-check, Fatigue
Transportation, launching
Deflections, Stresses,
Code-check, Fatigue
Non-linear analysis,
collapse, accidents,
re-qualifications
© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
3
Transportation analysis - Hydrostatic analysis - Hydrodynamic/structural - Deflection and stress check - Code check - Fatigue
© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
4
Packages:
DeepC Coupled global
response
of moored deep water
floating systems
GeniE Design of beam and
plate offshore
structures
HydroD Hydrodynamic
analysis
of ship and floating
offshore structures
The SESAM suite of programs
© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
Our tools – your solutions – your decisions
5
Linear analysis (wave, pile/soil)
Deflections, Stresses,
Code-check, Fatigue, Earthquake
Transportation, lifting
Deflections, Stresses,
Code-check, Fatigue
xml
Transportation, launching
Deflections, Stresses,
Code-check, Fatigue
xml
Non-linear analysis,
collapse, accidents,
re-qualifications
fem
© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
Transportation analysis – procedure
From base model – export the deck to new GeniE analysis
Import an existing barge (or make a new)
Move deck to intersect with skid beams or sea-fastenings
Export model for hydrostatic and hydrodynamic analysis
Import results from hydrodynamic and run linear structural analysis followed by
result evaluations
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© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
Transportation analysis – export to hydro-static/dynamics
Same model may be used for
- Panel model
- Mass model
- Compartment model – the filling and balancing are done during equilibrium analysis
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© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
Transportation analysis – hydrostatic analysis
The model imported in HydroD Hydrostatic analysis
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Intact condition
Damaged condition
Hydrostatic rule check
© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
Transportation analysis – hydrodynamic analysis
Intact condition
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Response variables
Pressure distribution Structural forces and stresses
Stress evaluation
Code checking
Fatigue
© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
Transportation analysis – hydrodynamic analysis
Results from hydrodynamic analysis form the basis for
- Stress evaluations
- Deflection checking
- Code checking
- Fatigue – fatigue damage can be used as input to in-place fatigue analysis
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Stress distribution Fatigue life
© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
13
Installation analysis - Lifting - Float-over - Launching - For all deformations, forces and
stresses
© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
Our tools – your solutions – your decisions
14
Linear analysis (wave, pile/soil)
Deflections, Stresses,
Code-check, Fatigue, Earthquake
Transportation, lifting
Deflections, Stresses,
Code-check, Fatigue
xml
Transportation, launching
Deflections, Stresses,
Code-check, Fatigue
xml
Non-linear analysis,
collapse, accidents,
re-qualifications
fem
© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
Marine operations
Sesam covers all stages of marine operations
- Transportation, launching, upending, float-over, lifting, towing etc.
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© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
Marine operations – launching & up-ending
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© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
Main new features version 6.1
Tension/Compression (T/C) analysis
- Uniform upwards load
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Tension elements
Compression elements
© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
Main new features version 6.1
Tension/Compression (T/C) analysis
- Uniform upwards load
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Tension elements
contributing to stiffness
Positive SIGXX
Compression elements
not contributing to stiffness
No axial stress
Compression/tension (truss)
elements contributing to
stiffness
© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
Main new features version 6.1
Unconnected X-joints
- No FE node created in connection
- Important for trusses and tension/compression analysis
- Important for data transfer to Usfos to avoid a “false” plastic hinge
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No FE node
in intersection
© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
Main new features version 6.1
T/C and unconnected X-joints
- Structure mass
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Compr. element in compression has negative SigXX
Compr. element in tension has no SigXX
Tension element in tension has positive SigXX
Tension element in compression has no SigXX
© Det Norske Veritas AS. All rights reserved.
SesamTM
13 December 2011
21
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and the environment
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